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http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1718

Summary: Fail to bootup sandy bridge under PAE with x2apic
enabled
Product: Xen
Version: unstable
Platform: Other
OS/Version: Windows
Status: NEW
Severity: normal
Priority: P1
Component: Hypervisor
AssignedTo: xen-bugs@lists.xensource.com
ReportedBy: shaohui.zheng@intel.com


(ia32/ia32e/IA64): ia32
Guest Arch (ia32/ia32e/IA64):
Guest OS Type (Linux/Windows):
Change Set: 22132
Hardware: sandy bridge
Other:


Bug detailed description:
--------------------------
We got an sandy bridge recently, and try to build a nightly test environment on
it. But we find it doesn't bootup under PAE . From the log , we find it fail to
enable x2apic. Follow weidong's suggestion, we disable the x2apic in grub(add
x2apic=0 in xen's arg) and it boot success.

attachment show the detail of the failed log

So here is the work around way to boot xen(PAE) in sandy bridge:
add "x2apic=0" in xen's arg in grub.

Reproduce steps:
----------------
1.install rhel5u5-ia32 in sandy bridge
2.install latest xen(cs:22132)
3.reboot machine to boot up xen.


Current result:
----------------
machine start fail.

Expected result:
----------------
machine start success

Basic root-causing log:
----------------------


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